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Root hair formation: F-actin-dependent tip growth is initiated by local assembly of profilin-supported F-actin meshworks accumulated within expansin-enriched bulges.
Constitutive expression of the GFP-mouse talin fusion protein in transgenic Arabidopsis allowed in vivo confirmation of the presence of distinct F-actin meshworks within outgrowing bulges and at tips of young root hairs, which suggests that installation of the actin-based tip growth machinery takes place only after expansin-associated bulge formation and requires assembly of profilin-supported dynamic F-actson meshworks.
Endocytosis of cell surface material mediates cell plate formation during plant cytokinesis.
It is shown that, in diverse plant species, cell surface material, including plasma membrane proteins, cell wall components, and exogenously applied endocytic tracers, is rapidly delivered to the forming cell plate even when de novo protein synthesis is blocked.
GFP-FABD2 fusion construct allows in vivo visualization of the dynamic actin cytoskeleton in all cells of Arabidopsis seedlings.
A construct consisting of GFP fused to the C-terminal half of A. thaliana fimbrin 1 reveals dynamic arrays of F-actin in all cells of stably transformed A.Thaliana seedlings, which is essential for understanding the numerous roles of the actin cytoskeleton in diverse processes of cell differentiation.
The Root Apex of Arabidopsis thaliana Consists of Four Distinct Zones of Growth Activities
In the growing apex of Arabidopsis thaliana primary roots, cells proceed through four distinct phases of cellular activities. These zones and their boundaries can be well defined based on their
Aluminum-Induced Gene Expression and Protein Localization of a Cell Wall-Associated Receptor Kinase in Arabidopsis1
Al-induced organ-specific expression of a WAK1 (cell wall-associated receptor kinase 1) gene and cell type-specific localization of WAK proteins in Arabidopsis are reported and transgenic plants overexpressing Wak1 showed an enhanced Al tolerance in terms of root growth when compared with the wild-type plants, making the WAK 1 one of the important candidates for plant defense against Al toxicity.
A Membrane Microdomain-Associated Protein, Arabidopsis Flot1, Is Involved in a Clathrin-Independent Endocytic Pathway and Is Required for Seedling Development[C][W]
Findings support the hypothesis that, in plant cells, Flot1 is involved in a clathrin-independent endocytic pathway and functions in seedling development.
The Signal Transducer NPH3 Integrates the Phototropin1 Photosensor with PIN2-Based Polar Auxin Transport in Arabidopsis Root Phototropism[C][W]
BL-induced root phototropism is based on the phot1/NPH3 signaling pathway, which stimulates the shootward auxin flux by modifying the subcellular targeting of PIN2 in the root apex transition zone.
Characterization of the unconventional myosin VIII in plant cells and its localization at the post-cytokinetic cell wall.
The plant myosin VIII is found to be concentrated at newly formed cross walls at the stage in which the phragmoplast cytoskeleton has depolymerized and the new cell plate is beginning to mature and it is suggested that this protein is involved in maturation of the cell plate and the re-establishment of cytoplasmic actin cables at sites of intercellular communication.
Cytoskeleton-Plasma Membrane-Cell Wall Continuum in Plants. Emerging Links Revisited1
This simulation shows how the architecture of the cytoskeleton and the extracellular matrix of eukaryotic cells changes over time through various mechanisms, including “cell reprograming”.
Aluminum-induced 1-->3-beta-D-glucan inhibits cell-to-cell trafficking of molecules through plasmodesmata. A new mechanism of aluminum toxicity in plants.
The data demonstrate that extracellular Al-induced callose deposition at PD could effectively block symplastic transport and communication in higher plants and suggest that Al-signal mediated localized alterations to calcium homeostasis may drive callose formation and PD closure.